De or het retourfles?

The correct Dutch article is:

de retourfles

How to use retourfles

the retourflesde retourfles
this retourflesdeze retourfles
that retourflesdie retourfles
our retourflesonze retourfles
your retourflesjouw retourfles
every retourfleselke retourfles
which retourfles?welke retourfles?
a big retourfles / the big retourfleseen grote retourfles, de grote retourfles